A brute-force way to run asciidoctor-pdf under Gradle

asciidoctor-pdf-with-gradle.gradle

buildscript {
    repositories {
        jcenter()
        mavenLocal()
    }


    dependencies {
        classpath 'com.github.jruby-gradle:jruby-gradle-plugin:0.1.2-SNAPSHOT'
        classpath 'org.ysb33r.gradle:vfs-gradle-plugin:0.5'
        classpath 'commons-httpclient:commons-httpclient:3.1'
    }
}

apply plugin: 'vfs'
apply plugin: 'com.github.jruby-gradle.base'
import com.github.jrubygradle.JRubyExec

ext {
	downloadDir = new File(buildDir,'download')
	apmDir = new File(downloadDir,'asciidoctor-pdf-master')
}

task download {
	if(!apmDir.exists()) {
		downloadDir.mkdirs()	
		vfs {
			cp  'zip:https://github.com/asciidoctor/asciidoctor-pdf/archive/master.zip', downloadDir, overwrite:true, recursive:true
		}
	}
}

dependencies {
    gems 'rubygems:asciidoctor:1.5.0'
    gems 'rubygems:coderay:1.1.0'
    gems 'rubygems:prawn:1.0.0'
    gems 'rubygems:prawn-templates:0.0.3'
    gems 'rubygems:prawn-svg:0.16.0'
    gems 'rubygems:slim:2.0.0'
    gems 'rubygems:thread_safe:0.3.4'
    gems 'rubygems:treetop:1.5.3'
}

task cleanDownload( type : Delete ) {
	delete downloadDir
}

task pdf( type: JRubyExec ) {
    dependsOn download, jrubyPrepareGems
    script new File(apmDir,'bin/asciidoctor-pdf')
    configuration 'gems'
    scriptArgs '-D',buildDir,'src/asciidoc/slides.adoc'
}